Asexual reproduction is best for growing raspberries.

It is not easy for raspberry to grow into seedlings with seeds, but it is often propagated by root tillers, striping and root cuttings, and tissue culture can be used if possible.

The main results are as follows: 1. The method of root-tillering and plant propagation: red berries are prone to basal branches and new roots are easy to occur in the underground part of basal branches. Dig up the plant at the end of the raspberry growing season and separate the basal branches with good roots, each of which is a new plant. This method consumes a lot of materials, the roots are old, and the vitality is weak, so it is not suitable for storage and should be planted immediately after dividing the plant. Some raspberry varieties are prone to produce a large number of root tiller branches, and some varieties can produce 30-60 root tiller branches per plant. These root tiller branches develop well in loose, moist and nutritious soil, and a large number of root tiller branches can be collected to propagate seedlings. In spring, the root should be properly cut at 60 cm from the 3-year-old tree to promote the root tiller seedling, and the root tiller seedling should be removed when the root tiller seedling is 1-1.3 m long to promote the root growth. Second, the method of root insertion and reproduction: in spring or autumn, combined with the regeneration of old plants and digging root tillers, the horizontal roots are dug out, and the root strips with buds and 0.5 cm thick are cut to grow into small segments of 8-12 cm. Dig a trench 10 cm deep in the nursery, put the roots flat at the bottom of the ditch, put one every 10 cm, fill it with loose humus, and cover the top with a layer of river sand or grass curtain to maintain moisture. In autumn, 1-2 new tillers with good roots can be formed on the roots. Third, striping propagation: BlackBerry rarely produces roots and tillers, but its buds are easy to root, and the tip of basal branches can touch the ground and can be used for strip propagation and cuttage propagation. In August, cover the top bud of the new shoot with a layer of soil or dig a small trench 5-6 cm deep, bend the top of the new shoot into the bottom of the ditch and cover it with soil 7-10 cm thick. At the end of autumn, the axillary bud can grow into a new shoot, grow a good root system, and form a new plant after separation from the mother plant. Horizontal striping can also be adopted to propagate, dig a shallow trench along the extension direction of the basal branch, bend the whole branch into the ditch and fix it, press the soil gently when the small root occurs in the new shoot, and can not cover the leaf, so that new shoots can be produced in the leaf axilla. several new plants are formed after they are separated from the plant at the end of autumn. After cutting off the basal branch, it can be propagated by arch cutting. the basal branch can be cut into small segments 40 cm long, and both ends will be inserted into the border in early spring, and new roots and shoots can occur in June. At this time, the cuttings will be cut from the middle into two seedlings, which can be grown in autumn. Fourth, tissue culture method: tissue culture can propagate a large number of seedlings in a short period of time, and the seedlings produced are free of pathogens, few diseases and insect pests, and strong seedling growth, which is mainly used for BlackBerry propagation. The propagation coefficient of red raspberry is large, so it is not necessary to use tissue culture to propagate seedlings.